The enthalpy change of the following reactions at `27^(@)C` are `{:(Na (s) + (1)/(2) Cl_(2) rarr NaCl (s),Delta_(r)H = -411 kJ//"mol",),(H_(2)(g) + S

The enthalpy change of the following reactions at `27^(@)C` are
`{:(Na (s) + (1)/(2) Cl_(2) rarr NaCl (s),Delta_(r)H = -411 kJ//"mol",),(H_(2)(g) + S (s) + 2O_(2) (g) rarr H_(2)SO_(4) (l),Delta_(r)H = -811 kJ//"mol",),(2Na (s) + S (s) + 2O_(2)(g) rarr Na_(2) SO_(4) (s),Delta_(r)H = -1382 kJ//"mol",),((1)/(2) H_(2) (g) + (1)/(2) Cl_(2) (g) rarr HCl(g),Delta_(r) H = -92 kJ//"mol", " " R = 8.3 J//K -"mol",):}`
form these data, the heat change of reaction at constant volume (in KJ/mol) at `27^(@)C` for the process `2NaCl (s) + H_(2)SO_(4) (l) rarr Na_(2)SO_(4) (s) + 2HCl (g)` is
A. 67
B. 62.02
C. 71.98
D. None